Merge pull request #29 from tats/bug/coding

Add coding tag to clarify non-ASCII
Merge pull request #30 from tats/feature/scan-bq-body

Support Base64/Quoted-Printable decoding for mew-scan-body
Typo fix for dot.mew
Merge pull request #31 from tats/bug/typo

Typo fix for dot.mew
Remove "\r" on Base64 decoding for mew-scan-body
Find a deep part for mew-scan-body
Merge branch 'bug/b64-cr'
Merge branch 'bug/deep-part'